# Merlin 6 Cluster

## Slurm clusters

* The new Slurm CPU cluster is called **`merlin6`**.
* The new Slurm GPU cluster is called [**`gmerlin6`**](../gmerlin6/cluster-introduction.md)
* The old Slurm *merlin* cluster is still active and best effort support is provided.

The cluster, was renamed as [**merlin5**](../merlin5/cluster-introduction.md).

From July 2019, **`merlin6`** becomes the **default Slurm cluster** and any job submitted from the login node will be submitted to that cluster if not.

* Users can keep submitting to the old *`merlin5`* computing nodes by using the option ``--cluster=merlin5``.
* Users submitting to the **`gmerlin6`** GPU cluster need to specify the option ``--cluster=gmerlin6``.

### Slurm 'merlin6'

**CPU nodes** are configured in a **Slurm** cluster, called **`merlin6`**, and
this is the ***default Slurm cluster***. Hence, by default, if no Slurm cluster is
specified (with the `--cluster` option), this will be the cluster to which the jobs
will be sent.